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Slide 1

Ex) Find the common multiples of 3 and 4.

Sol) Multiples of 3 = 3,6,9,12,15,18,21,24,27,30,33…………

Multiples of 4 = 4,8,12,16,20,24,28,32,36……………

Common multiples of 3 and 4 are

Slide 2

Ex) Find the common factors of 12 and 18.

Sol) Factors of 12 = 1,2,3,4,6, and 12

Factors of 18 = 1,2,3,6,9, and 18.

Slide 3

Two numbers are said to be co-prime, If they do not have any common factors other than ‘1’

(It is not necessary to be either of them to be prime numbers.

That is either one or both may be composite numbers)

Slide 4

A number is divisible by both 2 and 3.

By what other numbers will that number be divisible ?

Slide 5

A number is divisible by 15.

By what other numbers will that number be always divisible ?

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